GCC_CET_HOST_FLAGS: Check if host supports multi-byte NOPs

Check if host supports multi-byte NOPs before enabling CET on host.

config/

	PR binutils/27397
	* cet.m4 (GCC_CET_HOST_FLAGS): Check if host supports multi-byte
	NOPs.

libiberty/

	PR binutils/27397
	* configure: Regenerated.

1 files changed, 29 insertions, 0 deletions

diff --git a/libiberty/configure b/libiberty/configure
index 160b8c9..29a690d 100755
--- a/libiberty/configure
+++ b/libiberty/configure
@@ -5539,6 +5539,34 @@ else
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 
+int
+main ()
+{
+  asm ("endbr32");
+  return 0;
+}
+
+_ACEOF
+if ac_fn_c_try_run "$LINENO"; then :
+  have_multi_byte_nop=yes
+else
+  have_multi_byte_nop=no
+fi
+rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext \
+  conftest.$ac_objext conftest.beam conftest.$ac_ext
+fi
+
+    have_cet=no
+    if test x$have_multi_byte_nop = xyes; then
+      if test "$cross_compiling" = yes; then :
+  { { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
+$as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
+as_fn_error $? "cannot run test program while cross compiling
+See \`config.log' for more details" "$LINENO" 5; }
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
 static void
 foo (void)
 {
@@ -5575,6 +5603,7 @@ rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext \
   conftest.$ac_objext conftest.beam conftest.$ac_ext
 fi
 
+    fi
     if test x$enable_cet = xno -a x$have_cet = xyes; then
       as_fn_error $? "Intel CET must be enabled on Intel CET enabled host" "$LINENO" 5
     fi